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If your vehicle is equipped with a Flex-Fuel engine it is safe to use E85. If your vehicle is not equipped with a Flex Fuel engine, E85 will cause all kinds of driveability problems including a no-start. The vehicle should say "Flex-Fuel" on it or there will be a green "Leaf" emblem somewhere on the body.
For a 2002 Dodge Caravan, the best way to positively identify the engine is to look at the VIN. The only engine code that is Flex-Fuel is engine code "G". The engine code is the 8th digit of the VIN. The 10th digit is the year of manufacture and should be a "2" on your vehicle. If there is ANYOTHER engine code, DO NOT put E85 in the tank.

87 octane or better - at high altitudes you may be using 85 octane. In spite of claims - gasoline is formulated by area - not by company. Some states require a certain formula to be sold, but it requires the same formula from all refiners. Ethanol may be allowed and I have not come across any problems using it. If you run into a driveability problem - try a different brand.

The standard 10% ethanol will not cause any harm. Do NOT use E-85 or any more than 15% or you may have problems.

Note: 85 Flex fuel is 85% Ethanol and if you dilute it with 75% gasoline you get somewhere around 21% ethanol. That is a little higher than I would go, but it may not hurt anything. MPG will suffer as you increase the ethanol percentage.